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Gravity and centrifugal investment
casting of near-gamma TiAl turbocharger turbine wheels

L. Zemcik, A. Dlouhy

Due to their physical and chemical properties, alloys based on gamma TiAl represent highly promising materials for applications that require low density and very good resistance to plastic deformation at elevated and high temperatures. The target applications are therefore components of gas turbines (stationary and for aircraft), turbine wheels of turbochargers, and valves for automotive engines. The present study focuses on vacuum induction melting and investment casting of turbocharger turbine wheels in near-gamma TiAl intermetallic alloys. The attention is mainly given to a cost-effective melting process in which a primary alloy ingot is re-melted in a ceramic crucible and cast into a ceramic shell mould by gravity and centrifugal casting methods. The paper summarized the experience of melting TiAl alloys in alumina crucibles and yttria crucibles and the experience of casting into ceramic shell moulds made of various types of refractories.

Gravity and Centrifugal InvestmentGravity and Centrifugal Investment
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